Foundry flask



F. W. HAMEL FOUNDRY FLASK July 4, 1933.

Original Filed March 24, 1930 INVENTOR.

BY J'ran h/Jfamef ATTURN Patented July 4, 1933 narrsn STATES PATENT ()FF-lCE FRANK W. HAMEL, OF DETROIT, MICHIGAN rouivnnir FLASK [Substitute for application Serial No. 438,470, filed March 24, 1930. This application filed. August 81, 1932. swarm). 631,256. v

This invention relates to foundry flasks, and particularly to foundry flasks having the walls thereof separatelyformed of metal and rigidly connected, and is a substitute for 5 an application filed March 24;, 1930, under Serial No. 438,470. j

The object of the invention is to adapt the walls of a foundry flask to be individually and inexpensively cast and quickly and accurately assembled without necessity for either machining or skilled labor.

This and various other objects the invention attains by the construction hereinafter described and illustrated in the accompany- 5 ing drawing, wherein:

Fig. 1 is a plan view of in complete assembly. I

Fig. 2 is a cross sectional view of the same, taken upon the line 22 of Fig. 1.

Fig. 3 is a perspective view of one of the corner joints of the flask, showing its parts disassembled.

Fig. at is a similar view of the assembled joint.

" Fig. 5 is a cross secton of the corner joint,

taken upon the line 5-5 of Fig. 4.

In these views, the reference character 1 designates the separately formed walls of a metallic foundry flask. Said walls are preferably castings, and have the usual flare from top to bottom, facilitating withdrawal of the flask from a mold formed therein.

Two of the walls 1 are each correspondingly formed at their ends with a pair of heads 2 extending the full height of said walls, and formed with channels of a substantial C-shape. The other two walls 1 are each terminally formed with enlargements 3, extending the full height of said walls, and corresponding in cross section to the channels of the heads 2, but having a clearance from said channels when engaged therein, as illustrated.

In assembling the flask, clearance between the heads 2 and enlargements 3 is taken up by channel-shaped inserts 4, formed preferably of sheet metal and adapted to be driven very snugly into place. The longitudinal edge portions of said inserts project subthe improved flask 750 stantially toward each other as to conform to relatively reduced necks 5 connecting the enlargements 3 to their supporting walls. Thus, when said inserts are driven into place, rigid and permanent joints are established. To further insure rigidity and permanency 55 of said joints, it is preferred to form each wall carrying the enlargements 3 with a pair of outwardly projecting ribs 6 respectively ad acent to the necks 5, and a suitable number of pins 7 are driven into bores drilled jointly in said ribs, the heads 2, and inserts a, as best appears in Fig. 5.

The paired channeled heads 2 are so divergent downwardly as to establish the desired predetermined flare of walls carrying 65 the enlargement 3, since the latter conform in direction to said channels.

As compared to a foundry flask formed as a single casting, the herein-described flask may be produced at a considerable saving, 0 1ts separate walls being designed for rapid quantity production by casting machines. Said walls will preferably be of aluminum or some other light and fairly soft metal. The inserts 4: will be of a harder metal, as steel, and in being driven into the head 2 around the enlargements 3, will displace the softer metal to such extent as the latter obstructs entrance of said inserts.

It is to be understood that the flask as il- 80 lustrated may function either as a cope or drag member of a flask.

In assembling the described flask, the walls thereof are clamped against a suitable form, accurately determining the desired propor tions and rectangular form of the flask, the enlargements 3 being set into the channels of the heads 2. The inserts 4 are then hammered or otherwise driven into place, and the pins 7 are finally inserted after drilling of the bores to receive same.

It is to be noted that the shape of the interlocking parts forming each corner joint 1s such as to preserve the rectangular rela tion of the meeting walls. That is to say, any relative turning of the walls about the axes formed by their intersections is very positively prohibited. This is of great importance, when overjackets are to be employed upon the molds produced by flasksf as any variation in the flask from its original rectangular form will be duplicated in the mold, with the result that the latter will not properly conform to the overjacket and will be disturbed when the latter is applied.

l/Vhile it is apparent that the invention is well calculated to adequately fulfill the objects and advantages primarily stated, it is to be understood that the invention is susceptible to variation, modification and change within the spirit and scope of the subjoined claims.

Vhat I claim is:

1. In a foundry flask, a pair of walls formed respectively with a channeled head and with an enlargement engaging in said head, said enlargement being connected to the wall carrying it by a relatively reduced neck, and the channel being restricted opposite to said neck, and a substantially C-shaped insert snugly engaged in said channel and embracing said enlargement, whereby said walls are rigidly connected.

2. In a foundry flask, a pair of walls respectively formed with a channel-shaped head and with an enlargement engaging in said head, said enlargement being connected to the wall carrying it by a relatively reduced neck, an insert of substantial C-shape snugly engaged in said channel and embracing said enlargement, and a pin transversely engaging said channeled head, and establishing a further connection between said walls at their juncture.

3. In a flask, a pair of meeting walls respectively formed with a channeled head and with an enlargement engaging in said head, said enlargement being connected to the wall carrying it by a relatively reduced neck, and said channel being restricted oppositely to said neck, a substantially C-shaped insert snugly engaged in said head and embracing said enlargement, a rib co-extensive with said enlargement integrally projecting from the wall formed with said enlargement, and a pin transversely extended through said rib and channeled head.

4. A flask comprising a pair of meeting walls respectively formed at their meeting ends with a channeled head and with an enlargement engaging in said head and having a clearance therefrom, and an insert snugly engaged in the clearance space between said head and enlargement to rigidly connect said walls.

In testimony whereof I sign this specification FRANK W. HAMEL. 

